[Severe hyponatremia in acute porphyria. Central pontine myelinolysis as a complication of its treatment].

Two patients developed severe hyponatremia attributed to inappropriate antidiuretic hormone secretion during a crisis of acute porphyria, and were treated with intravenous hypertonic sodium solution. One of them developed clinical and radiological findings of pontine and extrapontine myelinolysis, which may constitute a risk in the treatment of this complication.